Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 147
Fig. 16.— Distribution curve of barelamj) (1) and same lamp in white glass £ tungstenlobe (2). … Fig. 17.—Distribution curve of bare tungstenlamp (1) and same lamp in Holophane globe (2). is becoming increasingly common formanufacturers to give the polar curvesof hght distribution resulting from agiven source A^ath a specified shade orreflector, and information of this kindundoubtedly adds…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
